毕业设计（论文）-车床变速箱操纵机构的拔叉及专用夹具设计.doc

高等教育自学考试本科毕业论文

车床变速箱操纵机构的拔叉及专用夹具
设计
考生姓名: 准考证号:
专业层次: 本科院(系):机械与动力工程学院
指导教师: 职称: 讲师
重庆科技学院
二O一O年十二月二十日

高等教育自学考试本科毕业论文
车床变速箱操纵机构的拔叉及专用夹具设计
考生姓名:
准考证号: 0
专业层次: 本科
指导教师:
院(系): 机械与动力工程学院
重庆科技学院
二O一O年十二月二十日
摘要
本次设计是车床变速箱中拔叉零件的加工工艺规程及一些工序的专用夹具设计。此拔叉零件的结构较为复杂,其加工的地方主要是孔和平面。本设计先加工孔后加工面。将孔与平面的加工明确划分成粗加工和精加工阶段以保证它们的加工精度。基准选择以拔叉右面的最大的平面作为粗基准,来加工中间的通孔,然后以此加工过的孔作为精基准。主要加工工序安排是先以中心孔定位加工出顶平面和右侧平面以及下面的大孔的两平面,再以中心孔定位加工出下端的大孔。加工时是用镗床镗孔。最后以这两个孔为基准,分别加工右侧的槽和顶面的螺纹底孔。整个加工过程选用了钻床、铣床和镗床。工件在机床上定位夹紧选用专用夹具,夹紧方式为手动夹紧,夹紧可靠,操作方便。因此生产效率较高,适用于大批量、流水线上加工。能够满足设计要求。
关键词:加工工艺,定位,夹紧,专用夹具
Lathe gearbox manipulated mechabism of fork and special fixture design
ABSTRACT
This design is a lather to e soon an appropriation for inside pulling out fork spare parts processing craft rules distance and some work prefaces tongs pull out the construction of the fork spare parts than plicacy, its the place that process is a peaceful in bore design processes after processing first the with flat surface the clear and definite dividing the line the bore the coarseness processes to process with the nicety the stage to guarantee their process the precise basis choice to pull out rough basis of conduct and actions of the biggest flat surface of the right in fork, process the in the center in general use bore, then be used as the precise basis with the bore that primarily work preface arrangement is first to process a flat surface with the center bore fixed position with the right side flat surface and below big bore of two flat surface, again with center bore the fixed position processes the big bore that carry processing is to use the boring machine boring these two bores as the basis finally, process the right-hand slot respectively with the thread bottom bore of the processes the process chose to use to the drill machine, miller with the boring machine .The tongs chooses to use the appro